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Back in 2007, Uruguay had a serious problem with no obvious answer: The economy was growing very fast, but there wasn't enough energy to power the rapid 1 ．

Then Ramón Méndez Galain, a physicist, started 2 different potential paths for Uruguay's energy future．Finally, he wrote a plan that Uruguay could almost entirely 3 renewable energy．There would be less 4 and it would be the most economical choice Uruguay could make in the long run．

Méndez Galain's plan was built around two simple 5 about his country．First, while there wasn't a domestic（国内的）supply of coal or oil, there was a great deal of 6 ．Second, that wind blew over a country that was known for 7 grassland．His plan for Uruguay's energy future was to 8 the empty grassland into hundreds of wind farms．

To solve the problem of how to pay for all those wind farms, Méndez Galain came up with a variation on a（n）9 used by some electric plants in neighboring Brazil, in which state-owned power plants handled energy generation, while 10 companies were in charge of power distribution and customer service．Méndez Galain's plan changed the relationship to the 11 , so that private companies would be in charge of setting up and 12 the wind farms, while the state-owned power companies would distribute that energy to its customers．

The strategy worked 13 well．Just within a few years, Méndez Galain had 14 what he had set out to do: 98% of Uruguay's 15 comes from renewable sources．

Moments ago, a seal was resting on a piece of floating ice deep in an Antaretic channel．Then three hungry killer whales appeared．When the seal noticed them, it was already surrounded．

On this sheet of sea ice, the nearly thousand-pound seal would be unreachable for most of his enemies in nature．But these killer whales had mastered a hunting technique called wave washing: working together to turn water into a weapon．

Having identified their target, the killer whales formed a battle line and started rushing toward the ice．Just before reaching it, they rolled to their sides in a single, synchronized（同步的）motion．The wave they created was so powerful that it flooded the ice sheet and washed the frightened seal close to the edge of the ice sheet．Slowly and methodically, they repeated the attack．At the third time, the wave sent the helpless seal flying into the sea．It struggled to climb onto a piece of ice, but then disappeared from view．．．

"The level of intelligence that went into making each wave was staggering ． They solved the problem with very complex teamwork．They used water as a tool," said wildlife filmmaker Bertie Gregory, who had spent a decade tracking those killer whales, known as Bls．"I rarely saw failed hunts．This behavior was not what they were born with．It was learned and mastered over decades．Every time they made waves, it almost felt like more of a teaching experience than hunting．It was terrifying to watch．"

But as Antarctica warms and sea ice disappears, seals are increasingly staying on land, out of killer whales' reach．

"I've found Bls are losing about 5 percent of their population every year．Whether this subgroup will go extinct or just adapt their behavior, I don't know," said Gregory．"But with fewer opportunities for the killer whales to wave wash, I'm seeing an extinction of a culture．"

If you're hoping to follow your ears to your next vacation destination, but haven't yet found a festival that calls your name, we've got a list of some of our favorites to help you plan your escape．

Guěa Trumpet Festival

The trumpet is a part of daily life in Serbia—present at births, celebrations, and burials．And the annual event has been going strong for more than 50 years to celebrate the instrument and its cultural significance in this country．

Positiv us Festival

Positivus is the largest music festival in Latvia, attracting big-name stars across all major genres and giving new artists a chance to shine．It's also one of the most accessible music festivals in the world, even for families with small children．Other pluses? Ticket prices are reasonable and the beautiful coastal location means you can swim in the water or hang in the cool shade of the forest on the same day, all while listening to live music．

Alfa Future People

Held in the Russian countryside, six hours east of Moscow by car, Alfa Future People is more than a massive electronic dance music（EDM）festival, with exhibitions on the latest related technology and athletic opportunities like a volleyball tournament and gymnastics classes．

Mysteryland

If you're into EDM, you won't want to miss Mysteryland．Not only is this Dutch festival a bellwether（风向标）of EDM, its grand stage setups will blow your mind．What's more, this is also one of the most sustainability-focused festivals in the world．In addition to readily available recycling stations and organic eats, attendees can plant trees to reduce their carbon footprint．